Muffler for internal-combustion engines.



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NUFFLEB FUN INTERNAL CONBUSTIDN ENGINES. applic-zin am occ. s, 1901.)

(Iolndel.)

UNITED STATES PATENT OEEICE.

CARL O. IIEDSTROM, OF PORTLAND, CONNECTICUT, ASSIGNOR TO GEORGE M. HENDEE, OE SPRINGFIELD, MASSACHUSETTS.

MUFFLER FOR INTERNAL-'COMBUSTION ENGINES.

SPECIFICATION forming part of Letters Patent No. 712,791, dated November 4, 1902.

Application tiled October 2S, 1901. Serial No. 80,192. (No model.)

To L7/Z whom, it may concern,.-

Be it known that I, CARL OscAE HEDsrRoM, a citizen of the United States of America, residing at Portland, in the county of Middle? sex and State of Connecticut, have invented new and useful Improvements in Mu'lliers for Internal-Combustion Engines, of which the following is a specification.

This invention relates to muffler construc- 1o tions for internal-combustion engines, and it has special reference to muftlers adapted for use on motor-cycles. From the nature of the construction of these machines it is hardly feasible to locate the muiler anywhere I5 except between the two wheels. Furthermore, constructors of these machines are under the necessity of keeping down the trans verse dimension of the machine or the tread, as it is called, at the lowest possizo ble point. Therefore the delivery end of the inufiier will be in close proximity to the rim of either one wheel or the other of the motorcycle. In this position the putt of the exhaust against the tire operates to dislodge z5 the dirt and dust adhering thereto, which is then scattered by the rotation of the wheel over the frame of the machine and the mechanism thereon.

The object of this invention is to provide 3o means for deflecting the outwardly-projected currents of the exhaust-gases and turn these currents toward a common center or toward each other in converging lines, whereby their forces may be expended one against the other and the noise ofthe exhaust thereby reduced,

the exhaust-gases being prevented from com ing in contact with the tire of either wheel.

In the drawings forming part of this specification, Figure 1 is a longitudinal section of 4o a mufiier embodying my invention. Fig. 2

is a half-sectional view on line 2 2, Fig. l.

AReferring to the drawings, there is shown a mul'lier of the well-known type comprising a series of nested concentric cylinders supported between suitable heads, the central one ot' the cylinders being connected with the exhaust-port of the engine and iirst receiving the exhaust-gases, which pass through perforations in the walls of the different cyl- 5o inders successively into and through the annular passages between the latter, finding an exit iinally at the end of the passage between the outer cylinder and the next one thereto.

.This is only one of various mu'liers of this type 'to which the invention is applicable. 55 They all discharge the gases in lines parallel with the axis of the muffler. In the construction shown the various cylinders from the cent-er outward are lettered, respectively, a,

l), c, d, and e. The heads are indicated byf 6o and g and the deflecting-plate by 7i. The perforations through the walls of the cylinders are indicated by t', and j indicates the tubular connection between the muffler and the exhaust-port of the motor. The perforations through the head f, through which the exhaust-gases finally escape against the deflecting-plate h, are lettered k.

In carrying out my invention I apply the plate 7i (which in this case is a circular plate) 70 over the end of the muliler, through which the exhaust-gases are finally discharged to the atmosphere. This plate is made, preferably as shown in the drawings, with a chambered portion Z, located immediately over the discharge ports or perforations 7c, the inner edge of the plate lying parallel substantially with the surface olz the edge or end of the muler to which the said plate is attached and at some distance from the plate, whereby Se a narrow slit m is provided through which the gases after entering the chamber Z may escape at all points, and assuming that the discharge into said chamber l is uniform the final escape of the gases through the said slit n?. will be in converging lines, which in their counteracting ettect will tend to neutralize what little expansive force remains in said gases.

The manner of fastening the deflecting- 9o plate h to the end of the muffler is immaterial, a simple means being shown inthe drawings, which consists in turning a groove in the flange on the head of the muffler, then iitting this annular plate thereover, and rolling or otherwise forcing the metal into said groove. It is also immaterial which end ot the muliler the plate is applied to, that being governed entirely by the location of the discharge-opening. roo

Having thus described my invention, what I claim, anddesire to secure by Letters Patent of the United States, is-

In a muler having closed ends and a dis- 5 charge-opening in one of said ends, the combination of a defiecting-plate secured by one edge to said end, and having,r its opposite edge in close proximity to the surface of said end, whereby the gases are turned from their normal line of discharge and are deected to Io issue from said plate in opposing directions,

in the same plane.

CARL O. HEDSTROM.

Witnesses:

K. I. CLEMoNs, WM. H. CHAPIN. 

